A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 105
eye is placedat A, and the tube A B is directed toany distant object, as X, and any otherobject behind the observer, as Z, will beseen, apparently under the first objecta in the mirror G H, by reflection from the mirror K L, when the observer hassucceeded in getting in line between the two objects.…
Surveying
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